Intracavity Faraday modulation spectroscopy (INFAMOS): A tool for radical detection.
Intracavity Faraday modulation spectroscopy (INFAMOS): A tool for radical detection.
复制标题
DOI：
10.1063/1.4985900
复制
发表时间：
2017-08
期刊：
影响因子：
--
通讯作者：
M. Gianella;T. Pinto;Xia Wu;G. Ritchie
中科院分区：
文献类型：
--
作者：
M. Gianella;T. Pinto;Xia Wu;G. Ritchie
提出了腔内法拉第调制光谱技术，将光反馈腔增强光谱技术与法拉第调制光谱技术相结合，极大地提高了磁场中激光与顺磁性样品的相互作用路径长度。我们描述了第一个原型的基础上的连续波量子级联激光器的基础上选择的一氧化氮（1890 cm-1），由线性腔（精细度F=6300）和水冷螺线管的基本振转R-分支跃迁为目标。我们证明了最小可检测的费尔德常数Vmin=4.7×10-14 rad cm-1 G-1 Hz-1/2（SNR = 1），对应于单程旋转角1.6×10-10 rad Hz-1/2和检测限0.21 ppbv Hz-1/2 NO。
We present the intra-cavity Faraday modulation spectroscopy technique, whereby optical feedback cavity-enhanced spectroscopy is coupled with Faraday modulation spectroscopy to greatly enhance the interaction path length of a laser beam with a paramagnetic sample in a magnetic field. We describe a first prototype based upon a cw quantum cascade laser targeting a selection of fundamental rovibrational R-branch transitions of nitric oxide (1890 cm-1), consisting of a linear cavity (finesse F=6300) and a water-cooled solenoid. We demonstrate a minimum detectable Verdet constant of Vmin=4.7×10-14 rad cm-1 G-1 Hz-1/2 (at SNR = 1), corresponding to a single-pass rotation angle of 1.6×10-10 rad Hz-1/2 and a limit of detection of 0.21 ppbv Hz-1/2 NO.